/Engine/Plugins/Developer/Concert/ConcertSync/ConcertSyncClient/Source/ConcertSyncClient/Public/IConcertClientDataStore.h
The options flags used to register a key/value handler.
enum EConcertDataStoreChangeNotificationOptions { None = 0, NotifyOnInitialValue = 1 << 0, NotifyOnTypeMismatch = 1 << 1, }